<!doctype html>
<html>
<head>
<meta charset='UTF-8'><meta name='viewport' content='width=device-width initial-scale=1'>
<title>Intent</title><style type='text/css'>html {overflow-x: initial !important;}:root { --bg-color:#ffffff; --text-color:#333333; --select-text-bg-color:#B5D6FC; --select-text-font-color:auto; --monospace:"Lucida Console",Consolas,"Courier",monospace; }
html { font-size: 14px; background-color: var(--bg-color); color: var(--text-color); font-family: "Helvetica Neue", Helvetica, Arial, sans-serif; -webkit-font-smoothing: antialiased; }
body { margin: 0px; padding: 0px; height: auto; bottom: 0px; top: 0px; left: 0px; right: 0px; font-size: 1rem; line-height: 1.42857; overflow-x: hidden; background: inherit; tab-size: 4; }
iframe { margin: auto; }
a.url { word-break: break-all; }
a:active, a:hover { outline: 0px; }
.in-text-selection, ::selection { text-shadow: none; background: var(--select-text-bg-color); color: var(--select-text-font-color); }
#write { margin: 0px auto; height: auto; width: inherit; word-break: normal; overflow-wrap: break-word; position: relative; white-space: normal; overflow-x: visible; padding-top: 40px; }
#write.first-line-indent p { text-indent: 2em; }
#write.first-line-indent li p, #write.first-line-indent p * { text-indent: 0px; }
#write.first-line-indent li { margin-left: 2em; }
.for-image #write { padding-left: 8px; padding-right: 8px; }
body.typora-export { padding-left: 30px; padding-right: 30px; }
.typora-export .footnote-line, .typora-export li, .typora-export p { white-space: pre-wrap; }
@media screen and (max-width: 500px) {
  body.typora-export { padding-left: 0px; padding-right: 0px; }
  #write { padding-left: 20px; padding-right: 20px; }
  .CodeMirror-sizer { margin-left: 0px !important; }
  .CodeMirror-gutters { display: none !important; }
}
#write li > figure:last-child { margin-bottom: 0.5rem; }
#write ol, #write ul { position: relative; }
img { max-width: 100%; vertical-align: middle; }
button, input, select, textarea { color: inherit; font: inherit; }
input[type="checkbox"], input[type="radio"] { line-height: normal; padding: 0px; }
*, ::after, ::before { box-sizing: border-box; }
#write h1, #write h2, #write h3, #write h4, #write h5, #write h6, #write p, #write pre { width: inherit; }
#write h1, #write h2, #write h3, #write h4, #write h5, #write h6, #write p { position: relative; }
p { line-height: inherit; }
h1, h2, h3, h4, h5, h6 { break-after: avoid-page; break-inside: avoid; orphans: 2; }
p { orphans: 4; }
h1 { font-size: 2rem; }
h2 { font-size: 1.8rem; }
h3 { font-size: 1.6rem; }
h4 { font-size: 1.4rem; }
h5 { font-size: 1.2rem; }
h6 { font-size: 1rem; }
.md-math-block, .md-rawblock, h1, h2, h3, h4, h5, h6, p { margin-top: 1rem; margin-bottom: 1rem; }
.hidden { display: none; }
.md-blockmeta { color: rgb(204, 204, 204); font-weight: 700; font-style: italic; }
a { cursor: pointer; }
sup.md-footnote { padding: 2px 4px; background-color: rgba(238, 238, 238, 0.7); color: rgb(85, 85, 85); border-radius: 4px; cursor: pointer; }
sup.md-footnote a, sup.md-footnote a:hover { color: inherit; text-transform: inherit; text-decoration: inherit; }
#write input[type="checkbox"] { cursor: pointer; width: inherit; height: inherit; }
figure { overflow-x: auto; margin: 1.2em 0px; max-width: calc(100% + 16px); padding: 0px; }
figure > table { margin: 0px !important; }
tr { break-inside: avoid; break-after: auto; }
thead { display: table-header-group; }
table { border-collapse: collapse; border-spacing: 0px; width: 100%; overflow: auto; break-inside: auto; text-align: left; }
table.md-table td { min-width: 32px; }
.CodeMirror-gutters { border-right: 0px; background-color: inherit; }
.CodeMirror-linenumber { user-select: none; }
.CodeMirror { text-align: left; }
.CodeMirror-placeholder { opacity: 0.3; }
.CodeMirror pre { padding: 0px 4px; }
.CodeMirror-lines { padding: 0px; }
div.hr:focus { cursor: none; }
#write pre { white-space: pre-wrap; }
#write.fences-no-line-wrapping pre { white-space: pre; }
#write pre.ty-contain-cm { white-space: normal; }
.CodeMirror-gutters { margin-right: 4px; }
.md-fences { font-size: 0.9rem; display: block; break-inside: avoid; text-align: left; overflow: visible; white-space: pre; background: inherit; position: relative !important; }
.md-diagram-panel { width: 100%; margin-top: 10px; text-align: center; padding-top: 0px; padding-bottom: 8px; overflow-x: auto; }
#write .md-fences.mock-cm { white-space: pre-wrap; }
.md-fences.md-fences-with-lineno { padding-left: 0px; }
#write.fences-no-line-wrapping .md-fences.mock-cm { white-space: pre; overflow-x: auto; }
.md-fences.mock-cm.md-fences-with-lineno { padding-left: 8px; }
.CodeMirror-line, twitterwidget { break-inside: avoid; }
.footnotes { opacity: 0.8; font-size: 0.9rem; margin-top: 1em; margin-bottom: 1em; }
.footnotes + .footnotes { margin-top: 0px; }
.md-reset { margin: 0px; padding: 0px; border: 0px; outline: 0px; vertical-align: top; background: 0px 0px; text-decoration: none; text-shadow: none; float: none; position: static; width: auto; height: auto; white-space: nowrap; cursor: inherit; -webkit-tap-highlight-color: transparent; line-height: normal; font-weight: 400; text-align: left; box-sizing: content-box; direction: ltr; }
li div { padding-top: 0px; }
blockquote { margin: 1rem 0px; }
li .mathjax-block, li p { margin: 0.5rem 0px; }
li { margin: 0px; position: relative; }
blockquote > :last-child { margin-bottom: 0px; }
blockquote > :first-child, li > :first-child { margin-top: 0px; }
.footnotes-area { color: rgb(136, 136, 136); margin-top: 0.714rem; padding-bottom: 0.143rem; white-space: normal; }
#write .footnote-line { white-space: pre-wrap; }
@media print {
  body, html { border: 1px solid transparent; height: 99%; break-after: avoid; break-before: avoid; }
  #write { margin-top: 0px; padding-top: 0px; border-color: transparent !important; }
  .typora-export * { -webkit-print-color-adjust: exact; }
  html.blink-to-pdf { font-size: 13px; }
  .typora-export #write { padding-left: 32px; padding-right: 32px; padding-bottom: 0px; break-after: avoid; }
  .typora-export #write::after { height: 0px; }
}
.footnote-line { margin-top: 0.714em; font-size: 0.7em; }
a img, img a { cursor: pointer; }
pre.md-meta-block { font-size: 0.8rem; min-height: 0.8rem; white-space: pre-wrap; background: rgb(204, 204, 204); display: block; overflow-x: hidden; }
p > .md-image:only-child:not(.md-img-error) img, p > img:only-child { display: block; margin: auto; }
p > .md-image:only-child { display: inline-block; width: 100%; }
#write .MathJax_Display { margin: 0.8em 0px 0px; }
.md-math-block { width: 100%; }
.md-math-block:not(:empty)::after { display: none; }
[contenteditable="true"]:active, [contenteditable="true"]:focus { outline: 0px; box-shadow: none; }
.md-task-list-item { position: relative; list-style-type: none; }
.task-list-item.md-task-list-item { padding-left: 0px; }
.md-task-list-item > input { position: absolute; top: 0px; left: 0px; margin-left: -1.2em; margin-top: calc(1em - 10px); border: none; }
.math { font-size: 1rem; }
.md-toc { min-height: 3.58rem; position: relative; font-size: 0.9rem; border-radius: 10px; }
.md-toc-content { position: relative; margin-left: 0px; }
.md-toc-content::after, .md-toc::after { display: none; }
.md-toc-item { display: block; color: rgb(65, 131, 196); }
.md-toc-item a { text-decoration: none; }
.md-toc-inner:hover { text-decoration: underline; }
.md-toc-inner { display: inline-block; cursor: pointer; }
.md-toc-h1 .md-toc-inner { margin-left: 0px; font-weight: 700; }
.md-toc-h2 .md-toc-inner { margin-left: 2em; }
.md-toc-h3 .md-toc-inner { margin-left: 4em; }
.md-toc-h4 .md-toc-inner { margin-left: 6em; }
.md-toc-h5 .md-toc-inner { margin-left: 8em; }
.md-toc-h6 .md-toc-inner { margin-left: 10em; }
@media screen and (max-width: 48em) {
  .md-toc-h3 .md-toc-inner { margin-left: 3.5em; }
  .md-toc-h4 .md-toc-inner { margin-left: 5em; }
  .md-toc-h5 .md-toc-inner { margin-left: 6.5em; }
  .md-toc-h6 .md-toc-inner { margin-left: 8em; }
}
a.md-toc-inner { font-size: inherit; font-style: inherit; font-weight: inherit; line-height: inherit; }
.footnote-line a:not(.reversefootnote) { color: inherit; }
.md-attr { display: none; }
.md-fn-count::after { content: "."; }
code, pre, samp, tt { font-family: var(--monospace); }
kbd { margin: 0px 0.1em; padding: 0.1em 0.6em; font-size: 0.8em; color: rgb(36, 39, 41); background: rgb(255, 255, 255); border: 1px solid rgb(173, 179, 185); border-radius: 3px; box-shadow: rgba(12, 13, 14, 0.2) 0px 1px 0px, rgb(255, 255, 255) 0px 0px 0px 2px inset; white-space: nowrap; vertical-align: middle; }
.md-comment { color: rgb(162, 127, 3); opacity: 0.8; font-family: var(--monospace); }
code { text-align: left; vertical-align: initial; }
a.md-print-anchor { white-space: pre !important; border-width: initial !important; border-style: none !important; border-color: initial !important; display: inline-block !important; position: absolute !important; width: 1px !important; right: 0px !important; outline: 0px !important; background: 0px 0px !important; text-decoration: initial !important; text-shadow: initial !important; }
.md-inline-math .MathJax_SVG .noError { display: none !important; }
.html-for-mac .inline-math-svg .MathJax_SVG { vertical-align: 0.2px; }
.md-math-block .MathJax_SVG_Display { text-align: center; margin: 0px; position: relative; text-indent: 0px; max-width: none; max-height: none; min-height: 0px; min-width: 100%; width: auto; overflow-y: hidden; display: block !important; }
.MathJax_SVG_Display, .md-inline-math .MathJax_SVG_Display { width: auto; margin: inherit; display: inline-block !important; }
.MathJax_SVG .MJX-monospace { font-family: var(--monospace); }
.MathJax_SVG .MJX-sans-serif { font-family: sans-serif; }
.MathJax_SVG { display: inline; font-style: normal; font-weight: 400; line-height: normal; zoom: 90%; text-indent: 0px; text-align: left; text-transform: none; letter-spacing: normal; word-spacing: normal; overflow-wrap: normal; white-space: nowrap; float: none; direction: ltr; max-width: none; max-height: none; min-width: 0px; min-height: 0px; border: 0px; padding: 0px; margin: 0px; }
.MathJax_SVG * { transition: none 0s ease 0s; }
.MathJax_SVG_Display svg { vertical-align: middle !important; margin-bottom: 0px !important; margin-top: 0px !important; }
.os-windows.monocolor-emoji .md-emoji { font-family: "Segoe UI Symbol", sans-serif; }
.md-diagram-panel > svg { max-width: 100%; }
[lang="mermaid"] svg, [lang="flow"] svg { max-width: 100%; height: auto; }
[lang="mermaid"] .node text { font-size: 1rem; }
table tr th { border-bottom: 0px; }
video { max-width: 100%; display: block; margin: 0px auto; }
iframe { max-width: 100%; width: 100%; border: none; }
.highlight td, .highlight tr { border: 0px; }


.CodeMirror { height: auto; }
.CodeMirror.cm-s-inner { background: inherit; }
.CodeMirror-scroll { overflow: auto hidden; z-index: 3; }
.CodeMirror-gutter-filler, .CodeMirror-scrollbar-filler { background-color: rgb(255, 255, 255); }
.CodeMirror-gutters { border-right: 1px solid rgb(221, 221, 221); background: inherit; white-space: nowrap; }
.CodeMirror-linenumber { padding: 0px 3px 0px 5px; text-align: right; color: rgb(153, 153, 153); }
.cm-s-inner .cm-keyword { color: rgb(119, 0, 136); }
.cm-s-inner .cm-atom, .cm-s-inner.cm-atom { color: rgb(34, 17, 153); }
.cm-s-inner .cm-number { color: rgb(17, 102, 68); }
.cm-s-inner .cm-def { color: rgb(0, 0, 255); }
.cm-s-inner .cm-variable { color: rgb(0, 0, 0); }
.cm-s-inner .cm-variable-2 { color: rgb(0, 85, 170); }
.cm-s-inner .cm-variable-3 { color: rgb(0, 136, 85); }
.cm-s-inner .cm-string { color: rgb(170, 17, 17); }
.cm-s-inner .cm-property { color: rgb(0, 0, 0); }
.cm-s-inner .cm-operator { color: rgb(152, 26, 26); }
.cm-s-inner .cm-comment, .cm-s-inner.cm-comment { color: rgb(170, 85, 0); }
.cm-s-inner .cm-string-2 { color: rgb(255, 85, 0); }
.cm-s-inner .cm-meta { color: rgb(85, 85, 85); }
.cm-s-inner .cm-qualifier { color: rgb(85, 85, 85); }
.cm-s-inner .cm-builtin { color: rgb(51, 0, 170); }
.cm-s-inner .cm-bracket { color: rgb(153, 153, 119); }
.cm-s-inner .cm-tag { color: rgb(17, 119, 0); }
.cm-s-inner .cm-attribute { color: rgb(0, 0, 204); }
.cm-s-inner .cm-header, .cm-s-inner.cm-header { color: rgb(0, 0, 255); }
.cm-s-inner .cm-quote, .cm-s-inner.cm-quote { color: rgb(0, 153, 0); }
.cm-s-inner .cm-hr, .cm-s-inner.cm-hr { color: rgb(153, 153, 153); }
.cm-s-inner .cm-link, .cm-s-inner.cm-link { color: rgb(0, 0, 204); }
.cm-negative { color: rgb(221, 68, 68); }
.cm-positive { color: rgb(34, 153, 34); }
.cm-header, .cm-strong { font-weight: 700; }
.cm-del { text-decoration: line-through; }
.cm-em { font-style: italic; }
.cm-link { text-decoration: underline; }
.cm-error { color: red; }
.cm-invalidchar { color: red; }
.cm-constant { color: rgb(38, 139, 210); }
.cm-defined { color: rgb(181, 137, 0); }
div.CodeMirror span.CodeMirror-matchingbracket { color: rgb(0, 255, 0); }
div.CodeMirror span.CodeMirror-nonmatchingbracket { color: rgb(255, 34, 34); }
.cm-s-inner .CodeMirror-activeline-background { background: inherit; }
.CodeMirror { position: relative; overflow: hidden; }
.CodeMirror-scroll { height: 100%; outline: 0px; position: relative; box-sizing: content-box; background: inherit; }
.CodeMirror-sizer { position: relative; }
.CodeMirror-gutter-filler, .CodeMirror-hscrollbar, .CodeMirror-scrollbar-filler, .CodeMirror-vscrollbar { position: absolute; z-index: 6; display: none; }
.CodeMirror-vscrollbar { right: 0px; top: 0px; overflow: hidden; }
.CodeMirror-hscrollbar { bottom: 0px; left: 0px; overflow: hidden; }
.CodeMirror-scrollbar-filler { right: 0px; bottom: 0px; }
.CodeMirror-gutter-filler { left: 0px; bottom: 0px; }
.CodeMirror-gutters { position: absolute; left: 0px; top: 0px; padding-bottom: 30px; z-index: 3; }
.CodeMirror-gutter { white-space: normal; height: 100%; box-sizing: content-box; padding-bottom: 30px; margin-bottom: -32px; display: inline-block; }
.CodeMirror-gutter-wrapper { position: absolute; z-index: 4; background: 0px 0px !important; border: none !important; }
.CodeMirror-gutter-background { position: absolute; top: 0px; bottom: 0px; z-index: 4; }
.CodeMirror-gutter-elt { position: absolute; cursor: default; z-index: 4; }
.CodeMirror-lines { cursor: text; }
.CodeMirror pre { border-radius: 0px; border-width: 0px; background: 0px 0px; font-family: inherit; font-size: inherit; margin: 0px; white-space: pre; overflow-wrap: normal; color: inherit; z-index: 2; position: relative; overflow: visible; }
.CodeMirror-wrap pre { overflow-wrap: break-word; white-space: pre-wrap; word-break: normal; }
.CodeMirror-code pre { border-right: 30px solid transparent; width: fit-content; }
.CodeMirror-wrap .CodeMirror-code pre { border-right: none; width: auto; }
.CodeMirror-linebackground { position: absolute; left: 0px; right: 0px; top: 0px; bottom: 0px; z-index: 0; }
.CodeMirror-linewidget { position: relative; z-index: 2; overflow: auto; }
.CodeMirror-wrap .CodeMirror-scroll { overflow-x: hidden; }
.CodeMirror-measure { position: absolute; width: 100%; height: 0px; overflow: hidden; visibility: hidden; }
.CodeMirror-measure pre { position: static; }
.CodeMirror div.CodeMirror-cursor { position: absolute; visibility: hidden; border-right: none; width: 0px; }
.CodeMirror div.CodeMirror-cursor { visibility: hidden; }
.CodeMirror-focused div.CodeMirror-cursor { visibility: inherit; }
.cm-searching { background: rgba(255, 255, 0, 0.4); }
@media print {
  .CodeMirror div.CodeMirror-cursor { visibility: hidden; }
}


html { font-size: 16px; }
body { background: rgb(255, 255, 255); font-family: "Source Han Sans SC", sans-serif; color: rgb(85, 85, 85); }
#write { max-width: 60em; margin: 0px auto; padding: 20px 30px 50px; }
h1, h2, h3, h4, h5, h6 { position: relative; margin-top: 1em; margin-bottom: 1em; font-weight: bold; line-height: 1.4em; }
h1 { font-size: 2em; line-height: 1.2em; }
h2 { font-size: 1.5em; line-height: 1.225em; }
h3 { font-size: 1.3em; line-height: 1.43em; }
h4 { font-size: 1.2em; }
h5 { font-size: 1em; }
h6 { font-size: 1em; color: rgb(153, 153, 153); }
hr { border: 1px solid rgb(221, 221, 221); }
a { text-decoration: none; color: rgb(37, 143, 184); }
a:hover, a:active { text-decoration: underline; }
ul, ol { padding-left: 2em; }
.task-list { padding-left: 2em; }
.task-list-item { padding-left: 1.6em; }
.task-list-item input { top: 3px; left: 8px; }
table { width: 100%; border-collapse: collapse; border-spacing: 0px; }
table th { font-weight: bold; border-bottom: 3px solid rgb(221, 221, 221); padding-bottom: 0.5em; }
table td { border-bottom: 1px solid rgb(221, 221, 221); padding: 10px 0px; }
blockquote { border-left: 5px solid rgb(221, 221, 221); padding-left: 0.5em; font-family: "Source Han Serif SC", serif; color: rgb(85, 85, 85); }
blockquote blockquote { padding-right: 0px; }
.md-fences, code, tt { margin: 0px 0.3em; padding: 0px 0.3em; background: rgb(238, 238, 238); font-family: mononoki, monospace; text-shadow: rgb(255, 255, 255) 0px 1px; }
.md-fences { margin: 15px auto; padding: 0.7em 1em; text-shadow: none; }
.cm-s-inner.CodeMirror { background-color: rgb(38, 50, 56); color: rgb(233, 237, 237); }
.cm-s-inner .CodeMirror-gutters { background: rgb(38, 50, 56); color: rgb(83, 127, 126); border: none; }
.cm-s-inner .CodeMirror-guttermarker, .cm-s-inner .CodeMirror-guttermarker-subtle, .cm-s-inner .CodeMirror-linenumber { color: rgb(83, 127, 126); }
.cm-s-inner .CodeMirror-cursor { border-left: 1px solid rgb(248, 248, 240); }
.cm-s-inner div.CodeMirror-selected { background: rgba(255, 255, 255, 0.15); }
.cm-s-inner.CodeMirror-focused div.CodeMirror-selected { background: rgba(255, 255, 255, 0.1); }
.cm-s-inner .CodeMirror-line::selection, .cm-s-inner .CodeMirror-line > span::selection, .cm-s-inner .CodeMirror-line > span > span::selection { background: rgba(255, 255, 255, 0.1); }
.cm-s-inner .CodeMirror-activeline-background { background: rgba(0, 0, 0, 0); }
.cm-s-inner .cm-keyword { color: rgb(199, 146, 234); }
.cm-s-inner .cm-operator { color: rgb(233, 237, 237); }
.cm-s-inner .cm-variable-2 { color: rgb(128, 203, 196); }
.cm-s-inner .cm-variable-3, .cm-s-inner .cm-type { color: rgb(130, 177, 255); }
.cm-s-inner .cm-builtin { color: rgb(222, 203, 107); }
.cm-s-inner .cm-atom { color: rgb(247, 118, 105); }
.cm-s-inner .cm-number { color: rgb(247, 118, 105); }
.cm-s-inner .cm-def { color: rgb(233, 237, 237); }
.cm-s-inner .cm-string { color: rgb(195, 232, 141); }
.cm-s-inner .cm-string-2 { color: rgb(128, 203, 196); }
.cm-s-inner .cm-comment { color: rgb(84, 110, 122); }
.cm-s-inner .cm-variable { color: rgb(130, 177, 255); }
.cm-s-inner .cm-tag { color: rgb(128, 203, 196); }
.cm-s-inner .cm-meta { color: rgb(128, 203, 196); }
.cm-s-inner .cm-attribute { color: rgb(255, 203, 107); }
.cm-s-inner .cm-property { color: rgb(128, 203, 174); }
.cm-s-inner .cm-qualifier { color: rgb(222, 203, 107); }
.cm-s-inner .cm-variable-3, .cm-s-inner .cm-type { color: rgb(222, 203, 107); }
.cm-s-inner .cm-tag { color: rgb(255, 83, 112); }
.cm-s-inner .cm-error { color: rgb(255, 255, 255); background-color: rgb(236, 95, 103); }
.cm-s-inner .CodeMirror-matchingbracket { text-decoration: underline; color: white !important; }
.md-fences { background-color: rgb(38, 50, 56); color: rgb(233, 237, 237); border: none; }
.md-fences .code-tooltip { background-color: rgb(38, 50, 56); }
.cm-s-typora-default { background-color: rgb(38, 50, 56); color: rgb(233, 237, 237); }
.cm-s-typora-default .CodeMirror-gutters { background: rgb(38, 50, 56); color: rgb(83, 127, 126); border: none; }
.cm-s-typora-default .CodeMirror-guttermarker, .cm-s-typora-default .CodeMirror-guttermarker-subtle, .cm-s-typora-default .CodeMirror-linenumber { color: rgb(83, 127, 126); }
.cm-s-typora-default .CodeMirror-cursor { border-left: 1px solid rgb(248, 248, 240); }
.cm-s-typora-default div.CodeMirror-selected { background: rgba(255, 255, 255, 0.15); }
.cm-s-typora-default.CodeMirror-focused div.CodeMirror-selected { background: rgba(255, 255, 255, 0.1); }
.cm-s-typora-default .CodeMirror-line::selection, .cm-s-typora-default .CodeMirror-line > span::selection, .cm-s-typora-default .CodeMirror-line > span > span::selection { background: rgba(255, 255, 255, 0.1); }
.cm-s-typora-default .CodeMirror-activeline-background { background: rgba(0, 0, 0, 0); }
.cm-s-typora-default .cm-keyword { color: rgb(199, 146, 234); }
.cm-s-typora-default .cm-operator { color: rgb(233, 237, 237); }
.cm-s-typora-default .cm-variable-2 { color: rgb(128, 203, 196); }
.cm-s-typora-default .cm-variable-3 { color: rgb(130, 177, 255); }
.cm-s-typora-default .cm-builtin { color: rgb(222, 203, 107); }
.cm-s-typora-default .cm-atom { color: rgb(247, 118, 105); }
.cm-s-typora-default .cm-number { color: rgb(247, 118, 105); }
.cm-s-typora-default .cm-def { color: rgb(233, 237, 237); }
.cm-s-typora-default .cm-string { color: rgb(195, 232, 141); }
.cm-s-typora-default .cm-string-2 { color: rgb(128, 203, 196); }
.cm-s-typora-default .cm-comment { color: rgb(84, 110, 122); }
.cm-s-typora-default .cm-variable { color: rgb(130, 177, 255); }
.cm-s-typora-default .cm-tag { color: rgb(128, 203, 196); }
.cm-s-typora-default .cm-meta { color: rgb(128, 203, 196); }
.cm-s-typora-default .cm-attribute { color: rgb(255, 203, 107); }
.cm-s-typora-default .cm-property { color: rgb(128, 203, 174); }
.cm-s-typora-default .cm-qualifier { color: rgb(222, 203, 107); }
.cm-s-typora-default .cm-variable-3 { color: rgb(222, 203, 107); }
.cm-s-typora-default .cm-tag { color: rgb(255, 83, 112); }
.cm-s-typora-default .cm-error { color: rgb(255, 255, 255); background-color: rgb(236, 95, 103); }
.cm-s-typora-default .CodeMirror-matchingbracket { text-decoration: underline; color: white !important; }
.md-fences { background-color: rgb(38, 50, 56); color: rgb(233, 237, 237); border: none; }
.md-fences .code-tooltip { background-color: rgb(38, 50, 56); }
.CodeMirror div.CodeMirror-cursor { border-left: 1px solid rgb(228, 98, 154); }
#write pre.md-meta-block { padding: 1em; background-color: rgb(255, 255, 255); border-bottom: 1px dashed rgb(221, 221, 221); color: rgb(128, 203, 196); margin-top: 0px !important; }
.md-image > .md-meta { color: inherit; }
header, .context-menu, .megamenu-content, footer { font-family: "Source Han Sans SC", sans-serif; }
@media print {
  html { font-size: 13px; }
  table, pre { break-inside: avoid; }
  pre { overflow-wrap: break-word; }
}
header, .context-menu, .megamenu-content, footer { font-family: "Helvetica Neue", Helvetica, "Segoe UI", Arial, sans-serif; }
.md-diagram-panel-preview { color: rgb(38, 50, 56); }

 .typora-export li, .typora-export p, .typora-export,  .footnote-line {white-space: normal;} 
</style>
</head>
<body class='typora-export os-windows' >
<div  id='write'  class = 'is-node'><h1><a name="intent" class="md-header-anchor"></a><span>Intent</span></h1><h2><a name="%E5%9B%9B%E5%A4%A7%E7%BB%84%E4%BB%B6%E4%B8%8Eintent%E5%90%84%E4%B8%AA%E5%B1%9E%E6%80%A7%E7%9A%84%E5%85%B3%E7%B3%BB" class="md-header-anchor"></a><span>四大组件与intent各个属性的关系</span></h2><p><span>以下讨论的属性包括action，category，data，type  </span></p><ol start='' ><li><span>Activity：全都能用，category可能只有activity能用，所以其他组件谨慎使用category</span></li><li><span>Service：全都能用，但是Google建议使用显示启动Service，所以action和category最好不用</span></li><li><span>BroadcastReceiver：全都能用</span></li><li><span>ContentProvider：不能用intent启动，所以全都不能用</span></li></ol><h2><a name="componentname" class="md-header-anchor"></a><span>ComponentName</span></h2><p><span>intent对象设置component的方法：</span><code>setComponent(ComponentName name)</code><span></span><br/><span>ComponentName的构造器：</span><code>ComponentName(Context pkg, Class&lt;?&gt; cls)</code><span>，</span><code>ComponentName(Context pkg, String cls)</code><span>，</span><code>ComponentName(String pkg, String cls)</code></p><h2><a name="action" class="md-header-anchor"></a><span>Action</span></h2><p><span>对应</span><code>&lt;intent-filter&gt;</code><span>元素中的</span><code>&lt;action&gt;</code><span>元素</span><br/><span>intent对象设置action的方法：</span><code>setAction(String action)</code><span></span><br/><strong><span>一个Intent只有一个action</span></strong><span>  </span></p><h3><a name="%E6%A0%87%E5%87%86-activity-action" class="md-header-anchor"></a><span>标准 Activity Action</span></h3><figure><table><thead><tr><th><span>Action常量</span></th><th><span>对应字符串</span></th><th><span>简单说明</span></th></tr></thead><tbody><tr><td><span>ACTION_MAIN</span></td><td><span>android.intent.action.MAIN</span></td><td><span>应用程序入口</span></td></tr><tr><td><span>ACTION_VIEW</span></td><td><span>android.intent.action.VIEW</span></td><td><span>显示指定数据</span></td></tr><tr><td><span>ACTION_ATTACH_DATA</span></td><td><span>android.intent.action.ATTACH_DATA</span></td><td><span>指定某块数据将被附加到其他地方</span></td></tr><tr><td><span>ACTION_EDIT</span></td><td><span>android.intent.action.EDIT</span></td><td><span>编辑指定数据</span></td></tr><tr><td><span>ACTION_PICK</span></td><td><span>android.intent.action.PICK</span></td><td><span>从列表中选择某项并返回所选的数据</span></td></tr><tr><td><span>ACTION_CHOOSER</span></td><td><span>android.intent.action.CHOOSER</span></td><td><span>显示一个Activity选择器</span></td></tr><tr><td><span>ACTION_GET_CONTENT</span></td><td><span>android.intent.action.GET_CONTENT</span></td><td><span>让用户选择数据，并返回所选数据</span></td></tr><tr><td><span>ACTION_DIAL</span></td><td><span>android.intent.action.DIAL</span></td><td><span>显示拨号面板</span></td></tr><tr><td><span>ACTION_CALL</span></td><td><span>android.intent.action.CALL</span></td><td><span>直接向指定用户打电话</span></td></tr><tr><td><span>ACTION_SEND</span></td><td><span>android.intent.action.SEND</span></td><td><span>向其他人发送数据</span></td></tr><tr><td><span>ACTION_SENDTO</span></td><td><span>android.intent.action.SENDTO</span></td><td><span>向其他人发送消息</span></td></tr><tr><td><span>ACTION_ANSWER</span></td><td><span>android.intent.action.ANSWER</span></td><td><span>应答电话</span></td></tr><tr><td><span>ACTION_INSERT</span></td><td><span>android.intent.action.INSERT</span></td><td><span>插入数据</span></td></tr><tr><td><span>ACTION_DELETE</span></td><td><span>android.intent.action.DELETE</span></td><td><span>删除数据</span></td></tr><tr><td><span>ACTION_RUN</span></td><td><span>android.intent.action.RUN</span></td><td><span>运行数据</span></td></tr><tr><td><span>ACTION_SYNC</span></td><td><span>android.intent.action.SYNC</span></td><td><span>执行数据同步</span></td></tr><tr><td><span>ACTION_PICK_ACTIVITY</span></td><td><span>android.intent.action.PICK_ACTIVITY</span></td><td><span>用于选择Activity</span></td></tr><tr><td><span>ACTION_SEARCH</span></td><td><span>android.intent.action.SEARCH</span></td><td><span>执行搜索</span></td></tr><tr><td><span>ACTION_WEB_SEARCH</span></td><td><span>android.intent.action.WEB_SEARCH</span></td><td><span>执行Web搜索</span></td></tr><tr><td><span>ACTION_FACTORY_TEST</span></td><td><span>android.intent.action.FACTORY_TEST</span></td><td><span>工厂测试的入口点</span></td></tr></tbody></table></figure><h3><a name="%E6%A0%87%E5%87%86broadcast-action%EF%BC%88%E5%8A%A0%E7%B2%97%E8%A1%A8%E7%A4%BA%E5%8F%AA%E8%83%BD%E7%94%B1%E7%B3%BB%E7%BB%9F%E5%8F%91%E5%87%BA%EF%BC%89" class="md-header-anchor"></a><span>标准Broadcast Action（加粗表示只能由系统发出）</span></h3><figure><table><thead><tr><th><span>Action常量</span></th><th><span>对应字符串</span></th><th><span>简单说明</span></th></tr></thead><tbody><tr><td><strong><span>ACTION_TIME_TICK</span></strong></td><td><span>android.intent.action.TIME_TICK</span></td><td><span>当前时间改变，每分钟发一次。接收它的BroadcastReceiver不能静态注册，只能动态注册</span></td></tr><tr><td><span>ACTION_TIME_CHANGED</span></td><td><span>android.intent.action.TIME_SET</span></td><td><span>时间被设置</span></td></tr><tr><td><strong><span>ACTION_TIMEZONE_CHANGED</span></strong></td><td><span>android.intent.action.TIMEZONE_CHANGED</span></td><td><span>时区被设置</span></td></tr><tr><td><strong><span>ACTION_BOOT_COMPLETED</span></strong></td><td><span>android.intent.action.BOOT_COMPLETED</span></td><td><span>s手机启动完毕</span></td></tr><tr><td><strong><span>ACTION_PACKAGE_ADDED</span></strong></td><td><span>android.intent.action.PACKAGE_ADDED</span></td><td><span>一个新的应用程序被安装</span></td></tr><tr><td><strong><span>ACTION_PACKAGE_CHANGED</span></strong></td><td><span>android.intent.action.PACKAGE_CHANGED</span></td><td><span>应用程序被改变，比如某个组件被关闭</span></td></tr><tr><td><strong><span>ACTION_PACKAGE_REMOVED</span></strong></td><td><span>android.intent.action.PACKAGE_REMOVED</span></td><td><span>应用程序被删除</span></td></tr><tr><td><strong><span>ACTION_PACKAGE_RESTARTED</span></strong></td><td><span>android.intent.action.PACKAGE_RESTARTED</span></td><td><span>应用程序被重启，与它相关的所有进程全部杀掉，然后重启</span></td></tr><tr><td><strong><span>ACTION_PACKAGE_DATA_CLEARED</span></strong></td><td><span>android.intent.action.PACKAGE_DATA_CLEARED</span></td><td><span>用户清理了应用程序的数据</span></td></tr><tr><td><strong><span>ACTION_PACKAGES_SUSPENDED</span></strong></td><td><span>android.intent.action.PACKAGES_SUSPENDED</span></td><td><span>应用程序被挂起</span></td></tr><tr><td><strong><span>ACTION_PACKAGES_UNSUSPENDED</span></strong></td><td><span>android.intent.action.PACKAGES_UNSUSPENDED</span></td><td><span>软件包不被挂起</span></td></tr><tr><td><strong><span>ACTION_UID_REMOVED</span></strong></td><td><span>android.intent.action.UID_REMOVED</span></td><td><span>一个用户ID被移除</span></td></tr><tr><td><strong><span>ACTION_BATTERY_CHANGED</span></strong></td><td><span>android.intent.action.BATTERY_CHANGED</span></td><td><span>手机正在充电。只能动态注册</span></td></tr><tr><td><strong><span>ACTION_BATTERY_LOW</span></strong></td><td><span>android.intent.action.BATTERY_LOW</span></td><td><span>手机电量不足</span></td></tr><tr><td><strong><span>ACTION_POWER_CONNECTED</span></strong></td><td><span>android.intent.action.ACTION_POWER_CONNECTED</span></td><td><span>手机连接上了外部电源</span></td></tr><tr><td><strong><span>ACTION_POWER_DISCONNECTED</span></strong></td><td><span>android.intent.action.ACTION_POWER_DISCONNECTED</span></td><td><span>手机断开外部电源</span></td></tr><tr><td><strong><span>ACTION_SHUTDOWN</span></strong></td><td><span>android.intent.action.ACTION_SHUTDOWN</span></td><td><span>手机正在关机</span></td></tr></tbody></table></figure><blockquote><p><code>ACTION_POWER_CONNECTED</code><span>和</span><code>ACTION_BATTERY_CHANGED</code><span>的区别是前者只在连上电源时发送一次，而后者会在充电过程中不断被发送，告知应用程序当前手机的电量等信息</span></p></blockquote><h2><a name="category" class="md-header-anchor"></a><span>Category</span></h2><p><span>对应</span><code>&lt;intent-filter&gt;</code><span>元素中的</span><code>&lt;category&gt;</code><span>元素</span><br/><span>intent对象添加category的方法：</span><code>addCategory(String category)</code><span></span><br/><span>intent对象删除category的方法：</span><code>removeCategory(String category)</code></p><ul><li><strong><span>一个Activity可以包含多个category</span></strong><span>，只有当Intent包含的category是Activity包含的category的子集时，Activity才能被启动  </span></li><li><span>所有Intent对象都会自动添加</span><code>Intent.CATAGORY_DEFAULT</code><span>属性，但是</span><code>&lt;catagory/&gt;</code><span>标签中不会自动添加</span><code>android.intent.category.DEFAULT</code><span>，所以所有</span><code>&lt;intent-filter&gt;</code><span>都要手动添加这一行</span></li></ul><p><span>以下只列出目前我明白其含义的category  </span></p><figure><table><thead><tr><th><span>Intent的常量</span></th><th><span>说明</span></th></tr></thead><tbody><tr><td><span>CATEGORY_DEFAULT</span></td><td><span>默认的Category</span></td></tr><tr><td><span>CATEGORY_HOME</span></td><td><span>开机时启动的第一个Activity，也就是启动器的Activity</span></td></tr><tr><td><span>CATEGORY_LAUNCHER</span></td><td><span>应用程序启动时的第一个Activity</span></td></tr></tbody></table></figure><h2><a name="data%E5%92%8Ctype" class="md-header-anchor"></a><span>Data和Type</span></h2><p><span>对应</span><code>&lt;intent-filter&gt;</code><span>元素中的</span><code>&lt;data&gt;</code><span>元素</span><br/><span>设置data：</span><code>setData(Uri data)</code><span>，对应</span><code>&lt;data&gt;</code><span>元素中的Uri相关属性，比如scheme、host、type</span><br/><span>设置type：</span><code>setType(String type)</code><span>，对应</span><code>&lt;data&gt;</code><span>元素中的mineType属性  </span></p><blockquote><p><span>setData()可以只设置data，setType()可以只设置type，但要既设置data又设置type只能使用setDataAndType()  </span></p></blockquote><p><strong><span>一个Intent最多只能包含一个Data和一个Type</span></strong><span>，intent中的data和type都已intent-filter中的某一个data元素匹配时，就算匹配成功</span></p><pre spellcheck="false" class="md-fences md-end-block md-fences-with-lineno ty-contain-cm modeLoaded" lang="xml"><div class="CodeMirror cm-s-inner CodeMirror-wrap" lang="xml"><div style="overflow: hidden; position: relative; width: 3px; height: 0px; top: 0px; left: 30px;"><textarea autocorrect="off" autocapitalize="off" spellcheck="false" tabindex="0" style="position: absolute; bottom: -1em; padding: 0px; width: 1000px; height: 1em; outline: none;"></textarea></div><div class="CodeMirror-scrollbar-filler" cm-not-content="true"></div><div class="CodeMirror-gutter-filler" cm-not-content="true"></div><div class="CodeMirror-scroll" tabindex="-1"><div class="CodeMirror-sizer" style="margin-left: 26px; margin-bottom: 0px; border-right-width: 0px; padding-right: 0px; padding-bottom: 0px;"><div style="position: relative; top: 0px;"><div class="CodeMirror-lines" role="presentation"><div role="presentation" style="position: relative; outline: none;"><div class="CodeMirror-measure"></div><div class="CodeMirror-measure"></div><div style="position: relative; z-index: 1;"></div><div class="CodeMirror-code" role="presentation" style=""><div class="CodeMirror-activeline" style="position: relative;"><div class="CodeMirror-activeline-background CodeMirror-linebackground"></div><div class="CodeMirror-gutter-background CodeMirror-activeline-gutter" style="left: -26px; width: 26px;"></div><div class="CodeMirror-gutter-wrapper CodeMirror-activeline-gutter" style="left: -26px;"><div class="CodeMirror-linenumber CodeMirror-gutter-elt CodeMirror-linenumber-show" style="left: 0px; width: 18px;">1</div></div><pre class=" CodeMirror-line " role="presentation"><span role="presentation" style="padding-right: 0.1px;"> <span class="cm-tag cm-bracket">&lt;</span><span class="cm-tag">data</span></span></pre></div><div style="position: relative;"><div class="CodeMirror-gutter-wrapper" style="left: -26px;"><div class="CodeMirror-linenumber CodeMirror-gutter-elt" style="left: 0px; width: 18px;">2</div></div><pre class=" CodeMirror-line " role="presentation"><span role="presentation" style="padding-right: 0.1px;"> &nbsp; <span class="cm-attribute">android:mimeType</span>=<span class="cm-string">"axe/*"</span></span></pre></div><div style="position: relative;"><div class="CodeMirror-gutter-wrapper" style="left: -26px;"><div class="CodeMirror-linenumber CodeMirror-gutter-elt" style="left: 0px; width: 18px;">3</div></div><pre class=" CodeMirror-line " role="presentation"><span role="presentation" style="padding-right: 0.1px;"> &nbsp; <span class="cm-attribute">android:host</span>=<span class="cm-string">"www.axe.com"</span></span></pre></div><div style="position: relative;"><div class="CodeMirror-gutter-wrapper" style="left: -26px;"><div class="CodeMirror-linenumber CodeMirror-gutter-elt" style="left: 0px; width: 18px;">4</div></div><pre class=" CodeMirror-line " role="presentation"><span role="presentation" style="padding-right: 0.1px;"> &nbsp; <span class="cm-attribute">android:path</span>=<span class="cm-string">"/mypath"</span></span></pre></div><div style="position: relative;"><div class="CodeMirror-gutter-wrapper" style="left: -26px;"><div class="CodeMirror-linenumber CodeMirror-gutter-elt CodeMirror-linenumber-show" style="left: 0px; width: 18px;">5</div></div><pre class=" CodeMirror-line " role="presentation"><span role="presentation" style="padding-right: 0.1px;"> &nbsp; <span class="cm-attribute">android:scheme</span>=<span class="cm-string">"axe"</span> <span class="cm-tag cm-bracket">/&gt;</span></span></pre></div></div></div></div></div></div><div style="position: absolute; height: 0px; width: 1px; border-bottom: 0px solid transparent; top: 100px;"></div><div class="CodeMirror-gutters" style="height: 100px;"><div class="CodeMirror-gutter CodeMirror-linenumbers" style="width: 26px;"></div></div></div></div></pre><pre spellcheck="false" class="md-fences md-end-block md-fences-with-lineno ty-contain-cm modeLoaded" lang="java"><div class="CodeMirror cm-s-inner CodeMirror-wrap" lang="java"><div style="overflow: hidden; position: relative; width: 3px; height: 0px; top: 0px; left: 30px;"><textarea autocorrect="off" autocapitalize="off" spellcheck="false" tabindex="0" style="position: absolute; bottom: -1em; padding: 0px; width: 1000px; height: 1em; outline: none;"></textarea></div><div class="CodeMirror-scrollbar-filler" cm-not-content="true"></div><div class="CodeMirror-gutter-filler" cm-not-content="true"></div><div class="CodeMirror-scroll" tabindex="-1"><div class="CodeMirror-sizer" style="margin-left: 26px; margin-bottom: 0px; border-right-width: 0px; padding-right: 0px; padding-bottom: 0px;"><div style="position: relative; top: 0px;"><div class="CodeMirror-lines" role="presentation"><div role="presentation" style="position: relative; outline: none;"><div class="CodeMirror-measure"><pre><span>xxxxxxxxxx</span></pre><div class="CodeMirror-linenumber CodeMirror-gutter-elt"><div>1</div></div></div><div class="CodeMirror-measure"></div><div style="position: relative; z-index: 1;"></div><div class="CodeMirror-code" role="presentation"><div class="CodeMirror-activeline" style="position: relative;"><div class="CodeMirror-activeline-background CodeMirror-linebackground"></div><div class="CodeMirror-gutter-background CodeMirror-activeline-gutter" style="left: -26px; width: 26px;"></div><div class="CodeMirror-gutter-wrapper CodeMirror-activeline-gutter" style="left: -26px;"><div class="CodeMirror-linenumber CodeMirror-gutter-elt CodeMirror-linenumber-show" style="left: 0px; width: 18px;">1</div></div><pre class=" CodeMirror-line " role="presentation"><span role="presentation" style="padding-right: 0.1px;"><span class="cm-variable">intent</span>.<span class="cm-variable">setDataAndType</span>(<span class="cm-variable">Uri</span>.<span class="cm-variable">parse</span>(<span class="cm-string">"axe://www.axe.com:8888/mypath"</span>),<span class="cm-string">"axe/abc"</span>);</span></pre></div></div></div></div></div></div><div style="position: absolute; height: 0px; width: 1px; border-bottom: 0px solid transparent; top: 20px;"></div><div class="CodeMirror-gutters" style="height: 20px;"><div class="CodeMirror-gutter CodeMirror-linenumbers" style="width: 26px;"></div></div></div></div></pre><h2><a name="extra" class="md-header-anchor"></a><span>Extra</span></h2><p><span>用putExtra和getXXXExtra来传递数据，一个Intent可以包含很多Extra  </span></p><blockquote><p><span>Extra和Data的区别我想应该是：Extra包含的是数据本身，传过去一个字符串，被接收后，对方就收到了一个字符串；而Data包含的是Uri，是数据的地址，所以对方只是收到了地址，还需要根据地址取出对象</span></p></blockquote><p><span>Intent有一些标准Extra，这些应该是用在putExtra方法中的key（键），但是它也规定了需要传递的值的类型（非强制）。用统一的键名和数据类型来传递一些固定类型的数据有利于统一编程规范，但是我还不了解这些标准Extra的意义。</span></p><h2><a name="flag" class="md-header-anchor"></a><span>Flag</span></h2><p><span>给intent设置flag：</span><code>setFlags (int flags)</code><span>同时设置多个flag，用</span><code>|</code><span>隔开  </span></p><p><code>FLAG_ACTIVITY_NEW_TASK</code></p><ol start='' ><li><span>用这个旗标去启动的activity如果没有设置taskAffinity，那这个旗标就不起作用</span></li><li><span>如果设置了taskAffinity，并且这个task不存在，那他就会新建这个task，并且把这个启动的activity作为这个task的根task</span></li><li><span>如果设置了taskAffinity，并且这个task已经存在，且这个activity已经作为这个task的根activity存在，那就直接把这个task放到前台</span></li><li><span>如果设置了taskAffinity，并且这个task已经存在，但是这个activity并不是这个task的根activity，那把这个task带到前台，并且在这个的task的栈顶再新建这个activity</span></li></ol><p><code>FLAG_ACTIVITY_SINGLE_TOP</code></p><p><span>等同于launchMode的singletop属性</span></p><p><code>FLAG_ACTIVITY_CLEAR_TOP</code></p><p><span>这个属性和launchMode的singletask有点像，同样是清空目标activity之上的所有activity，但不同的是这个旗标还多一个功能，就是在关闭目标activity之上的activity之前，把新的intent传递给目标activity，这意味着目标activity要被销毁并重建</span></p><p><code>FLAG_ACTIVITY_CLEAR_TASK</code></p><p><span>这个旗标的作用是要启动目标activity前，先将这个activity要进入的task清空，然后再新建这个activity。</span><br/><span>这个旗标只能和FLAG_ACTIVITY_NEW_TASK一起用，因为task被清空后，这个task就不存在了，所以要new task  </span></p><p><code>FLAG_ACTIVITY_EXCLUDE_FROM_RECENTS</code></p><ol start='' ><li><span>这个旗标没看懂，API文档的说法是设置了这个旗标的activity不会出现在近期任务列表中，但是近期任务列表本来就是不用来显示activity的，而是用来显示task的</span></li><li><span>但有一点可以确定，如果一个task的根activity被设置了这个旗标，那这个task不会出现在近期任务列表中</span></li><li><span>这个旗标的作用和</span><code>&lt;actvity&gt;</code><span>标签中的</span><code>android:excludeFromRecents=&quot;true&quot;</code><span>的效果是一样的</span></li></ol><p><code>FLAG_ACTIVITY_NO_HISTORY</code></p><p><span>设置了这个旗标的activity会在下次可见前被销毁。</span></p><p><span>举个例子，有一个activity有这个旗标，那我按home键，这时候什么都没发生，但是等我用近期任务列表切回到原来的task的时候，哪个activity会被销毁（ondestroy()方法会被调用）</span></p><p><code>FLAG_ACTIVITY_TASK_ON_HOME</code></p><ol start='' ><li><span>比如，A-&gt;B-&gt;C-&gt;D，如果在C启动D的时候设置了这个标志，那在D中按Back键则是直接回到桌面，而不是C。</span></li><li><span>只有D是在新的task中被创建时（也就是D的launchMode是singleInstance时，或者是给D指定了与C不同的taskAffinity并且加了</span><code>FLAG_ACTIVITY_NEW_TASK</code><span>标志时），使用</span><code>FLAG_ACTIVITY_TASK_ON_HOME</code><span>标志才会生效</span></li></ol><p><code>FLAG_ACTIVITY_REORDER_TO_FRONT</code></p><p><span>假设一个Task由四个Activity组成：A,B,C,D。如果D调用startActivity()来启动Activity B，那么，B会移动到历史stack的顶端，现在的次序变成A,C,D,B。在这期间没有activity被销毁，也不会有创建。</span></p><p><span>如果</span><code>FLAG_ACTIVITY_CLEAR_TOP</code><span>标志也设置的话，那么这个标志将被忽略。</span></p><p><code>FLAG_ACTIVITY_NO_ANIMATION</code></p><ol start='' ><li><span>启动activity时，禁用启动动画</span></li></ol><p><code>FLAG_ACTIVITY_FORWARD_RESULT</code></p><ol start='' ><li><span>O ----startActivityForResult()----&gt; A ----FLAG_ACTIVITY_FORWARD_RESULT----&gt; B</span></li><li><span>A的答复目标是O，如果A在启动B时使用了这个标志，A就会把答复目标O的信息传递给B，以便B将O作为它的答复目标。此时B调用setResult()时的结果信息都会传递给O，而不会给A。并且此时在A中调用setResult()的内容不会生效。我还没发现使A中setResult()生效的方法。</span></li></ol><p><span>这个标志不能与startActivityForResult()一起使用</span></p></div>
</body>
</html>